At the
apartment complex where Spencer lives, a family friend who declined to
be identified described him as a "good kid." He said Spencer's family
has had a difficult time since they learned of the arrest.

Authorities on Thursday said they had detained two people in
connection with the shooting. It is unclear whether the second person is
still being held.

Spencer is holds an active security guard license, according to the California Bureau of Security and Investigative Services.

The shooting -- outside a crowded Halloween party in the heart of the
USC campus -- rattled nerves, coming six months after two graduate
students were fatally shot in a robbery near the campus. It was the first shooting on
campus in at least two decades, according to Times archives.

Los Angeles police and USC officials said the shooting stemmed from an
argument between two people who were not affiliated with USC. The
gunman opened fire on a former Crenshaw High
School football star, Geno Hall. He was hit several times but is
expected to survive. Three other bystanders, none of them students, also
suffered non-life-threatening wounds.

USC President C.L. Max Nikias said in a statement that the school was
"carefully assessing and reviewing all of the university's policies
regarding visitors and events held on campus" but added that the risk of
such violence on campus was very low. He later told The Times in an
email that he would announce policy changes next week. Another school
official described the shooting as "totally an isolated incident."

"Although
this incident did not involve USC students and was resolved quickly, it
strikes at the heart of the Trojan family," Nikias said.